keyboard page: Shown the default configured value

Previously the keyboard page didn't show the default
configured value when enter into this page.
Now it works.

Change-Id: I18b362fb93d1761138a4d64f01824ceb01677a9a
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=966367
Signed-off-by: hadong <hadong0720@gmail.com>